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Thursday, November 7, 2013

What is NRR and why you need to derate it

NRR (Noise Reduction Rating) indicates the level of sound that hearing protection devices block out. The single number rating system is represented in decibels a user will be protected from.   The EPA requires all hearing protection products carry an NRR label.  Now that we know what NRR is, why is it not valid?  Here's the problem:  the number is based on a testing process done in a laboratory with test subjects fitted by a lab technician.  This scenario is not reflective of the real shop environment.  Who is responsible for fitting your employees?  Is the protection they use appropriate for your shop?  

Before you answer those questions OSHA has put together a formula for making the NRR more realistic.  The process, known as "derating", reduces the NRR by 50%.  To figure out the appropriate hearing protection needs for your employees, visit the OSHA website where they give a formula for estimating attenuation in your environment.

Check to see what Intech can provide for your employees' hearing protection.  

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